Precambrian, Paleozoic, Mesozoic, and Cenozoic Facts

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Time span of the Precambrian Period

4600 to 542 MYA

Time span of the Paleozoic era

488.3 to 251 MYA

Time span of the Mesozoic era

199.6 to 65.5 MYA

Time span of the Cenozoic era

55.8 MYA to now

Precambrian

The earth formed

Precambrian

Life arose

Precambrian

The first tectonic plates began to move

Precambrian

Eukaryotic cells evolved

Precambrian

The atmosphere became enriched in oxygen

Paleozoic

Cambrian Explosion

Paleozoic

Largest mass extinction in history

Paleozoic

The 6 major continents appeared

Paleozoic

First winged insects appeared

Paleozoic

First vertebrates appear

Mesozoic

Dinosaurs appeared

Mesozoic

First mammals appeared

Mesozoic

Forests were lush

Mesozoic

First birds appear

Mesozoic

Flowering plants appeared

Mesozoic

Ended with the extinction of dinosaurs

Mesozoic

High tectonic and volcanic activity

Mesozoic

248 to 65 mya

Cenozoic

Hominins appeared

Cenozoic

Ice ages occured

Cenozoic

Flowering plants became dominant

Cenozoic

Humans established civilization

Cenozoic

Mass extinction of large mammals

Cenozoic

Most recent

Cenozoic

Spans about 65 million years

Cenozoic

Mammals became most dominant land

Cenozoic

Starts from the extinction of non-avian dinosaurs

Cenozoic

The first humans (homo sapiens) evolved

Cenozoic

Minor extinction 36 mya

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